Gravitational lenses are powerful cosmic magnifying glasses that we now regularly use to explore a wide range of astrophysical phenomena. Strong gravitational lensing extends our observational reach to include objects that are too faint for even the most powerful telescopes with the added bonus of spatially resolving internal structures of distant objects at sub-kpc scales. By tracing the total matter distribution, gravitational lensing also illuminates dark matter halos of foreground deflectors that span the range from single galaxies to galaxy clusters up to \(z=1.62\)  [1]}, [2]}, [3]}. With high resolution observations from the Hubble Space Telescope at optical/near-IR wavelengths and the Atacama Large Millimetre Array at longer wavelengths, strong gravitational lensing has enabled multiple imaging of a single supernova, discovery and analysis of the highest redshift galaxies, mapping of dark matter distributions from the sub-kpc to Mpc regime, and measuring the Hubble constant [4]}, [5]}, [6]}, [7]}, [8]}, [9]}, [10]}.
